CN-117067853-B - Thermal management system and method and electric automobile

CN117067853BCN 117067853 BCN117067853 BCN 117067853BCN-117067853-B

Abstract

The invention discloses a heat management system, a heat management method and an electric automobile, wherein the heat management system comprises an air conditioning heat management loop, an electric drive heat management loop, a heating loop and a battery heat management loop, compared with the traditional battery water cooling and heating technology, the heat exchange between a refrigerant and a battery is higher in efficiency by adopting a battery direct cooling/direct heating technology, the battery cooling/heating does not need a water pump to provide a power source, the servo energy consumption is reduced, the uniformity of warm air temperature can be ensured by adopting an indirect heat pump air conditioning technology, the control difficulty of a passenger cabin temperature area is reduced, the problem that a heat exchanger of the direct heat pump technology is prone to frosting can be avoided to a certain extent, the weight brought by a cooling liquid pipeline and cooling liquid filling can be reduced by adopting a heavy refrigerant side design, and the use of a water valve is reduced.

Inventors

WANG GUOKUI
XU WENBIN
LIU ZIYANG
WANG XIN
WEI QIYIN

Assignees

重庆赛力斯新能源汽车设计院有限公司

Dates

Publication Date: 20260505
Application Date: 20230831

Claims (10)

1. The heat management system is characterized by comprising an air conditioner heat management loop, an electric drive heat management loop, a heating loop and a battery heat management loop; The air conditioner heat management loop comprises a compressor, an air condenser and a front/rear evaporator which are sequentially communicated to form a circulation loop, wherein a liquid inlet of the front/rear evaporator is provided with a first electronic expansion valve; The electric drive thermal management loop comprises a low-temperature radiator, a first water pump, an electric drive module, a second water pump and a chiller refrigerator which are sequentially communicated to form a circulation loop, wherein a liquid inlet of the water side of the chiller refrigerator is communicated with a liquid outlet of the second water pump, the liquid outlet of the water side of the chiller refrigerator is communicated with the liquid inlet of the low-temperature radiator through a three-way valve, a refrigerant side of the chiller refrigerator is respectively communicated with the liquid inlet of a first electronic expansion valve and the liquid outlet of a front/rear evaporator, a third electronic expansion valve is arranged at one end, connected with the liquid inlet of the first electronic expansion valve, of the refrigerant side of the chiller refrigerator, the first interface of the three-way valve is communicated with the liquid inlet of the low-temperature radiator, the second interface of the three-way valve is communicated with the liquid outlet of the water side of the chiller refrigerator, and the third interface of the three-way valve is communicated with the liquid inlet of the first water pump; the heating loop comprises a water-cooled condenser, a front/rear warm air core body and a third water pump which are sequentially communicated to form a circulation loop, wherein the water side of the water-cooled condenser is respectively communicated with the water-cooled condenser and the front/rear warm air core body; The battery thermal management loop comprises a battery pack, one end of the battery pack is communicated with a liquid inlet of the first electronic expansion valve through a fourth electronic expansion valve and a fifth stop valve respectively, the other end of the battery pack is communicated with a liquid outlet of the front/rear evaporator through a battery cooling electromagnetic valve, and the other end of the battery pack is communicated with a gas outlet of the compressor through a battery heating electromagnetic valve.
2. The thermal management system of claim 1, wherein the air conditioning thermal management circuit further comprises a reservoir dryer bottle located on a line between the water cooled condenser and front/rear evaporator.
3. The thermal management system of claim 1, wherein the air conditioning thermal management circuit further comprises a first coaxial pipe and a second coaxial pipe, the first coaxial pipe being located on a line between the water cooled condenser and the front/rear evaporator, the second coaxial pipe being located on a line between the front/rear evaporator and the compressor.
4. The thermal management system of claim 1, wherein the air conditioning thermal management circuit further comprises a gas-liquid separator coupled to an air inlet of the compressor.
5. The thermal management system of claim 1, wherein the electrically driven thermal management circuit further comprises a first expansion tank in communication with the cryogenic radiator.
6. The thermal management system of claim 1, wherein the heating loop further comprises a heater located on a line between a liquid outlet on a water side of the water cooled condenser and a liquid inlet of the front evaporator.
7. The thermal management system of claim 1, wherein the heating loop further comprises a second expansion tank, the second expansion tank being connected in parallel with the front evaporator.
8. The thermal management system of claim 4, wherein the liquid outlet of the compressor and the liquid inlet of the gas-liquid separator are both provided with temperature and pressure sensors.
9. A method of thermal management using the thermal management system of any one of claims 1-8, the method comprising at least one of the following thermal management modes: The first stop valve, the battery cooling electromagnetic valve, the first electronic expansion valve and the fourth electronic expansion valve are all opened, the second stop valve, the battery heating electromagnetic valve, the fifth stop valve and the third electronic expansion valve are all closed, and a first interface and a second interface of the three-way valve are communicated; the second stop valve, the battery heating electromagnetic valve, the fifth stop valve and the third electronic expansion valve are all opened, the first stop valve, the battery cooling electromagnetic valve, the first electronic expansion valve and the fourth electronic expansion valve are all closed, and a second interface of the three-way valve is communicated with a third interface; The first stop valve, the battery cooling electromagnetic valve, the first electronic expansion valve and the fourth electronic expansion valve are all closed, and a first interface and a second interface of the three-way valve are communicated; The first stop valve, the battery cooling electromagnetic valve, the battery heating electromagnetic valve, the fifth stop valve and the fourth electronic expansion valve are all closed, and a first interface and a second interface of the three-way valve are communicated; and in the fifth mode, the second stop valve and the first electronic expansion valve are all opened, the first stop valve, the battery cooling electromagnetic valve, the battery heating electromagnetic valve, the fifth stop valve, the third electronic expansion valve and the fourth electronic expansion valve are all closed, and the first interface and the second interface of the three-way valve are communicated.
10. An electric vehicle comprising the thermal management system of any one of claims 1-8.

Description

Thermal management system and method and electric automobile Technical Field The invention relates to the technical field of vehicle thermal management systems, in particular to a thermal management system and method and an electric vehicle. Background The current mainstream electric automobile heat management design can realize the coupling of all systems so as to reduce energy waste and make the heat management system more efficient. However, most of the prior art uses water valves to achieve coupling and different mode switching, focusing on the water side design. The design concept has the defects that if the split water valve is used in a large number, the corresponding connecting water pipe and the corresponding cooling liquid filling amount are increased, the cost and the weight of the whole vehicle are increased, and if the split water valve is an integrated water valve or an integrated module, the volume of the integrated module is not easy to balance with the flow resistance of the cooling liquid, the separation control of cold and hot flows, the liquid filling and the air exhausting and the like. Therefore, in order to solve the above problems of coupling and switching between different modes by using the water valve, a technology that can reduce the use of the water valve and reduce the weight increase caused by filling the coolant into the coolant pipeline is needed. Disclosure of Invention The invention aims to provide a thermal management system and method and an electric automobile, and aims to solve the problem that the existing electric automobile thermal management system needs more water valves to realize coupling and different mode switching. In order to solve the technical problems, in a first aspect, the invention provides a thermal management system, which comprises an air conditioner thermal management loop, an electric drive thermal management loop, a heating loop and a battery thermal management loop. The air conditioner thermal management loop comprises a compressor, an air condenser and a front/rear evaporator which are sequentially communicated to form a circulation loop, wherein a liquid inlet of the front/rear evaporator is provided with a first electronic expansion valve. The electric drive thermal management loop comprises a low-temperature radiator, a first water pump, an electric drive module, a second water pump and a refrigerating machine which are sequentially communicated to form a circulation loop, wherein a liquid outlet of a liquid inlet of a second water pump at the water side of the refrigerating machine is communicated with a liquid inlet of the low-temperature radiator through a three-way valve, a refrigerant side of the refrigerating machine is respectively communicated with a liquid inlet of a first electronic expansion valve and a liquid outlet of a front/rear evaporator, a third electronic expansion valve is arranged at one end, connected with the liquid inlet of the first electronic expansion valve, of the refrigerating machine, a first interface of the three-way valve is communicated with the liquid inlet of the low-temperature radiator, a second interface of the three-way valve is communicated with the liquid outlet of the water side of the refrigerating machine, and a third interface of the three-way valve is communicated with the liquid inlet of the first water pump. The heating loop comprises a water-cooled condenser, a front/rear warm air core body and a third water pump which are sequentially communicated to form a circulation loop, wherein the water side of the water-cooled condenser is respectively communicated with the water-cooled condenser and the front/rear warm air core body, the refrigerant side of the water-cooled condenser is connected with the air condenser in parallel, a liquid inlet of the air condenser is provided with a first stop valve, and a liquid inlet of the refrigerant side of the water-cooled condenser is provided with a second stop valve. The battery thermal management loop comprises a battery pack, one end of the battery pack is communicated with a liquid inlet of the first electronic expansion valve through a fourth electronic expansion valve and a fifth stop valve respectively, the other end of the battery pack is communicated with a liquid outlet of the front/rear evaporator through a battery cooling electromagnetic valve, and the other end of the battery pack is communicated with a gas outlet of the compressor through a battery heating electromagnetic valve. Further, the air conditioner thermal management circuit further comprises a liquid storage drying bottle, wherein the liquid storage drying bottle is positioned on a pipeline between the water-cooled condenser and the front/rear evaporator. The liquid storage drying bottle pair can temporarily store the refrigerant, so that the flow of the refrigerant is adapted to the refrigeration load, namely, the liquid refrigerant flowing out of the condenser is received and is a